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Snail-Trail Tale

Homing pigeons home for sure. Many mammals, possibly even humans, also possess a homing instinct. But snails? Taxonomically lowly molluscs? But read
this letter to the London Times.

"For ten days I have tried to banish a large snail which threatens soon-toemerge seedlings. Each day the snail gets lobbed into long grass of a nearby
paddock and each night it quits the paddock, crosses a concrete driveway and returns to lurk under its favourite rock. There is no question of mistaken
identity because its shell was marked with white paint after the first return trip."